Method for Driving Input-Output Device, and Input-Output Device

1. A method for driving an input-output device comprising a light-emitting device and a plurality of photodetectors arranged in matrix, wherein each of the plurality of photodetectors comprises a photoelectric conversion element, a first transistor, a second transistor, and a third transistor, wherein a first terminal of the photoelectric conversion element is electrically connected to a first terminal of the first transistor, wherein a second terminal of the first transistor is electrically connected to a gate of the second transistor, wherein a first terminal of the second transistor is electrically connected to a first terminal of the third transistor, wherein the first transistor comprises a channel formation layer comprising an oxide semiconductor, the method comprising the steps of: in each of a first frame period and a second frame period, emitting first light of a first color from the light-emitting device in a first sub frame period; emitting no light from the light-emitting device in a second sub frame period after the first sub frame period; and emitting second light of a second color from the light-emitting device in a third sub frame period after the second sub frame period; in the first sub frame period of the first frame period, inputting a first photodetection reset signal to a second terminal of the photoelectric conversion element of each of the plurality of photodetectors to reset the plurality of photodetectors; and inputting a first photodetection control signal to a gate of the first transistor of all of the plurality of photodetectors at once to generate first data of each of the plurality of photodetectors based on illuminance of light incident to the corresponding one of the plurality of photodetectors; inputting a first output selection signal generated by a shift register to a gate of the third transistor of each of the plurality of photodetectors selected by the first output selection signal to output the first data of the corresponding one of the plurality of photodetectors after the step of inputting the first photodetection control signal; in one of the second sub frame period to the third sub frame period of the second frame period, inputting a second photodetection reset signal to the second terminal of the photoelectric conversion element of each of the plurality of photodetectors to reset the plurality of photodetectors; and inputting a second photodetection control signal to the gate of the first transistor of all of the plurality of photodetectors at once to generate second data of each of the plurality of photodetectors based on illuminance of light incident to the corresponding one of the plurality of photodetectors; inputting a second output selection signal generated by the shift register to the gate of the third transistor of each of the plurality of photodetectors selected by the second output selection signal to output the second data of the corresponding one of the plurality of photodetectors after the step of inputting the second photodetection control signal, wherein the second photodetection control signal is the next signal of the first photodetection control signal input to the gate of the first transistor of all of the plurality of photodetectors.

2. The method for driving the input-output device, according to claim 1 , further comprising the steps of; in the first sub frame period of the first frame period, inputting the first photodetection control signal to the gate of the first transistor of all of the plurality of photodetectors at once to generate the first data of each of the plurality of photodetectors based on illuminance of light incident to the corresponding one of the plurality of photodetectors, in the first sub frame period of the second frame period, inputting the second photodetection control signal to the gate of the first transistor of all of the plurality of photodetectors at once to generate the second data of each of the plurality of photodetectors based on illuminance of light incident to the corresponding one of the plurality of photodetectors.

3. The method for driving the input-output device, according to claim 2 , wherein the input-output device comprises a display circuit, further comprising the steps of; in each of the first frame period and the second frame period, emitting no light from the light-emitting device in a fourth sub frame period after the third sub frame period; and emitting third light of a third color from the light-emitting device in a fifth sub frame period after the fourth sub frame period; inputting a first display data signal for the first color to set the display circuit in a first display state in the first sub frame period while emitting the first light; inputting a second display data signal for the second color to set the display circuit in a second display state in the third sub frame period while emitting the second light; and inputting a third display data signal for the third color to set the display circuit in a third display state in the fifth sub frame period while emitting the third light.

4. The method for driving the input-output device, according to claim 3 , wherein the light-emitting device is a light-emitting diode.

5. The method for driving the input-output device, according to claim 2 , wherein the first transistor comprises a channel formation layer comprising an oxide semiconductor with a carrier concentration of lower than 1×10 14 /cm 3 .

6. The method for driving the input-output device, according to claim 1 , further comprising the steps of; in the first sub frame period of the first frame period, inputting the first photodetection control signal to the gate of the first transistor of all of the plurality of photodetectors at once to generate the first data of each of the plurality of photodetectors based on illuminance of light incident to the corresponding one of the plurality of photodetectors, in the second sub frame period of the second frame period, inputting the second photodetection control signal to the gate of the first transistor of all of the plurality of photodetectors at once to generate the second data of each of the plurality of photodetectors based on illuminance of light incident to the corresponding one of the plurality of photodetectors.

7. The method for driving the input-output device, according to claim 6 , further comprising the steps of; generating third data corresponding to difference data between the first data and the second data.

8. The method for driving the input-output device, according to claim 7 , wherein the input-output device comprises a display circuit, further comprising the steps of; in each of the first frame period and the second frame period, emitting no light from the light-emitting device in a fourth sub frame period after the third sub frame period; and emitting third light of a third color from the light-emitting device in a fifth sub frame period after the fourth sub frame period; inputting a first display data signal for the first color to set the display circuit in a first display state in the first sub frame period while emitting the first light; inputting a second display data signal for the second color to set the display circuit in a second display state in the third sub frame period while emitting the second light; and inputting a third display data signal for the third color to set the display circuit in a third display state in the fifth sub frame period while emitting the third light.

9. The method for driving the input-output device, according to claim 8 , further comprising the steps of: in each of the first frame period and the second frame period, emitting no light from the light-emitting device in a sixth sub frame period after the fifth sub frame period.

10. The method for driving the input-output device, according to claim 9 , wherein the light-emitting device is a light-emitting diode.

11. The method for driving the input-output device, according to claim 9 , wherein the first transistor comprises a channel formation layer comprising an oxide semiconductor with a carrier concentration of lower than 1×10 14 /cm 3 .

12. A method for driving an input-output device comprising a light unit including Z (Z is a natural number of 3 or more) light-emitting diodes; X (X is a natural number) display circuits overlapping with the light unit; and Y (Y is a natural number of 2 or more) photodetectors arranged in matrix overlapping with the light unit, wherein each of the Y photodetectors comprises a photoelectric conversion element, a first transistor, a second transistor, and a third transistor, wherein a first terminal of the photoelectric conversion element is electrically connected to a first terminal of the first transistor, wherein a second terminal of the first transistor is electrically connected to a gate of the second transistor, wherein a first terminal of the second transistor is electrically connected to a first terminal of the third transistor, wherein the first transistor comprises a channel formation layer comprising an oxide semiconductor, the method comprising the steps of: in each of a first frame period and a second frame period, emitting first light of a first color from the Z light-emitting diodes of the light unit sequentially in a first sub frame period; emitting no light from the Z light-emitting diodes of the light unit in a second sub frame period after the first sub frame period; and emitting second light of a second color from the Z light-emitting diodes of the light unit sequentially in a third sub frame period after the second sub frame period; inputting a display selection signal and a first display data signal for the first color to the X display circuits before emitting the first light; setting the X display circuits in a first display state in accordance with data of the first display data signal in the first sub frame period while emitting the first light; inputting the display selection signal and a second display data signal for the first color to the X display circuits before emitting the second light; and setting the X display circuits in a second display state in accordance with data of the second display data signal in the third sub frame period while emitting the second light; in the first sub frame period of the first frame period, inputting a first photodetection reset signal to a second terminal of the photoelectric conversion element of each of the Y photodetectors to reset the Y photodetectors; and inputting a first photodetection control signal to a gate of the first transistor of all of the Y photodetectors at once to generate Y pieces of first data of each of the Y photodetectors based on illuminance of light incident to the corresponding one of the Y photodetectors; inputting a first output selection signal generated by a shift register to a gate of the third transistor of each of the Y photodetectors selected by the first output selection signal to output the corresponding one of the Y pieces of the first data of the corresponding one of the Y photodetectors after the step of inputting the first photodetection control signal; in one of the second sub frame period to the third sub frame period of the second frame period, inputting a second photodetection reset signal to the second terminal of the photoelectric conversion element of each of the Y photodetectors to reset the Y photodetectors; and inputting a second photodetection control signal to the gate of the first transistor of all of the Y photodetectors at once to generate Y pieces of second data of each of the Y photodetectors based on illuminance of light incident to the corresponding one of the Y photodetectors; inputting a second output selection signal generated by the shift register to the gate of the third transistor of each of the Y photodetectors selected by the second output selection signal to output the corresponding one of the Y pieces of the second data of the corresponding one of the Y photodetectors after the step of inputting the second photodetection control signal, wherein the second photodetection control signal is the next signal of the first photodetection control signal input to the gate of the first transistor of all of the Y photodetectors.

13. The method for driving an input-output device, according to claim 12 , further comprising the steps of: in each of the first frame period and the second frame period, emitting no light from the Z light-emitting diodes of the light unit in a fourth sub frame period after the third sub frame period; in the first sub frame period of the first frame period, inputting the first photodetection control signal to the gate of the first transistor of all of the Y photodetectors at once to generate the Y pieces of the first data of each of the Y photodetectors based on illuminance of light incident to the corresponding one of the Y photodetectors, in the second sub frame period of the second frame period, inputting the second photodetection control signal to the gate of the first transistor of all of the Y photodetectors at once to generate the Y pieces of the second data of each of the Y photodetectors based on illuminance of light incident to the corresponding one of the Y photodetectors, generating third data corresponding to difference data between the first data and the second data.

14. An input-output device comprising: a light unit comprising Z (Z is a natural number of 3 or more) light-emitting diodes; X (X is a natural number) display circuits over the light unit; Y(Y is a natural number of 2 or more) photodetectors arranged in matrix over the light unit; a reading circuit; and a data processing circuit, wherein each of the Y photodetectors comprises a photoelectric conversion element, a first transistor, a second transistor, and a third transistor, wherein a first terminal of the photoelectric conversion element is electrically connected to a first terminal of the first transistor, wherein a second terminal of the first transistor is electrically connected to a gate of the second transistor, wherein a first terminal of the second transistor is electrically connected to a first terminal of the third transistor, wherein the first transistor comprises a channel formation layer comprising an oxide semiconductor, wherein, in each of a first frame period and a second frame period, the Z light-emitting diodes of the light unit are configured to emit first light of a first color sequentially in a first sub frame period, emit no light in a second sub frame period after the first sub frame period, and emit second light of a second color sequentially in a third sub frame period after the second sub frame period, wherein, in each of the first frame period and the second frame period, the X display circuits are configured to receive a first display selection signal and a first display data signal to be in a first display state in accordance with data of the first display data signal in the first sub frame period and receive a second display selection signal and a second display data signal to be in a second display state in accordance with data of the second display data signal in the second sub frame period, wherein the Y photodetectors are configured to receive a first photodetection reset signal to a second terminal of the photoelectric conversion element of each of the Y photodetectors to reset the Y photodetectors in the first sub frame period of the first frame period, wherein all of the Y photodetectors are configured to receive a first photodetection control signal to a gate of the first transistor of all of the Y photodetectors at once to generate Y pieces of first data of each of the Y photodetectors based on illuminance of light incident to the corresponding one of the Y photodetectors in the first sub frame period of the first frame period, wherein the Y photodetectors are configured to receive a first output selection signal generated by a shift register to a gate of the third transistor of each of the Y photodetectors selected by the first output selection signal to output the corresponding one of the Y pieces of the first data of the corresponding one of the Y photodetectors after all of the Y photodetectors receive the first photodetection control signal, wherein the Y photodetectors are configured to receive a second photodetection reset signal to the second terminal of the photoelectric conversion element of each of the Y photodetectors to reset the Y photodetectors in the second sub frame period of the second frame period, wherein all of the Y photodetectors are configured to receive a second photodetection control signal to the gate of the first transistor of all of the Y photodetectors at once to generate Y pieces of second data of each of the Y photodetectors based on illuminance of light incident to the corresponding one of the Y photodetectors in the second sub frame period of the second frame period, wherein the Y photodetectors are configured to receive a second output selection signal generated by the shift register to the gate of the third transistor of each of the Y photodetectors selected by the second output selection signal to output the corresponding one of the Y pieces of the second data of the corresponding one of the Y photodetectors after all of the Y photodetectors receive a second photodetection control signal, wherein the reading circuit is configured to read the first data and the second data, wherein the data processing circuit is configured to generate difference data between the first data and the second data, and wherein the second photodetection control signal is the next signal of the first photodetection control signal input to the gate of the first transistor of all of the Y photodetectors.

15. The input-output device according to claim 14 , wherein at least one of the first transistor and the second transistor is a field-effect transistor.

16. The input-output device according to claim 14 , wherein at least one of the first transistor and the second transistor comprises a channel formation layer comprising an oxide semiconductor with a carrier concentration of lower than 1×10 14 /cm 3 .

17. The method for driving the input-output device, according to claim 1 , further comprising the steps of; in the first sub frame period of the first frame period, inputting the first photodetection control signal to the gate of the first transistor of all of the plurality of photodetectors at once to generate the first data of each of the plurality of photodetectors based on illuminance of light incident to the corresponding one of the plurality of photodetectors, in the third sub frame period of the second frame period, inputting the second photodetection control signal to the gate of the first transistor of all of the plurality of photodetectors at once to generate the second data of each of the plurality of photodetectors based on illuminance of light incident to the corresponding one of the plurality of photodetectors.